FuzzerExtraCounters.cpp

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//===- FuzzerExtraCounters.cpp - Extra coverage counters ------------------===//

//

// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.

// See https://llvm.org/LICENSE.txt for license information.

// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception

//

//===----------------------------------------------------------------------===//

// Extra coverage counters defined by user code.

//===----------------------------------------------------------------------===//

#include "FuzzerPlatform.h"

#include <cstdint>

#if LIBFUZZER_LINUX || LIBFUZZER_NETBSD || LIBFUZZER_FREEBSD ||                \

    LIBFUZZER_OPENBSD || LIBFUZZER_FUCHSIA || LIBFUZZER_EMSCRIPTEN

__attribute__((weak)) extern uint8_t __start___libfuzzer_extra_counters;

__attribute__((weak)) extern uint8_t __stop___libfuzzer_extra_counters;

namespace fuzzer {

uint8_t *ExtraCountersBegin() { return &__start___libfuzzer_extra_counters; }

uint8_t *ExtraCountersEnd() { return &__stop___libfuzzer_extra_counters; }

ATTRIBUTE_NO_SANITIZE_ALL

void ClearExtraCounters() {  // hand-written memset, don't asan-ify.

  uintptr_t *Beg = reinterpret_cast<uintptr_t*>(ExtraCountersBegin());

  uintptr_t *End = reinterpret_cast<uintptr_t*>(ExtraCountersEnd());

  for (; Beg < End; Beg++) {

    *Beg = 0;

    __asm__ __volatile__("" : : : "memory");

}  // namespace fuzzer

#else

// TODO: implement for other platforms.

namespace fuzzer {

uint8_t *ExtraCountersBegin() { return nullptr; }

uint8_t *ExtraCountersEnd() { return nullptr; }

void ClearExtraCounters() {}

}  // namespace fuzzer

#endif